Firenza L4-121 2.0L VIN K TBI (1987)
3.
Install a new MEM-CAL into the Engine Control Module (ECM) per instructions below. The new MEM-CAL is available from GMSPO. See
attached service part number chart in this bulletin. Install the identification label package to the ECM access door and to the left shock tower per
label kit, P/N 10154725 Instructions.
IMPORTANT:
The new MEM-CAL to be installed does not need or use the existing MAF signal; however, it does need and use the MAT signal.
A.
Pull the underhood ECM continuous power fuse or disconnect the battery and leave it disconnected for at least 10 minutes.
B.
Remove MAF relay, if applicable, and discard. Tape up connector to prevent water intrusion.
C.
Remove current MEM-CAL and install a new service MEM-CAL.
Clean throttle body I.D. bore in the area behind the throttle plate. Use a shop towel with GM Top Engine Cleaner, P/N 1052626, or
AC-Delco Carburetor Tune-Up Conditioner. P/N X66-A, or equivalent not containing Methyl Ethyl Ketone.
D.
Restore the battery power and place air conditioning controls (if equipped) in the "off" position.
E.
Firmly apply the parking brake and block the drive wheels. Start the engine, and shift the transaxle to "drive" for automatics or "neutral" for
manuals.
F.
Allow the engine to run until the engine cooling fan has cycled once, or a maximum of 10 minutes.
